package com.yhm.testSpringMvc.ACM;

import java.util.Scanner;

public  class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
//      int n = sc.nextInt();
//      while(n-->0){
        while (true) {



            int n = sc.nextInt();
            if(n==0)break;

            int totalNum = 0 ;

            for(int i=0;i<n;i++) {
                totalNum = totalNum + sc.nextInt();
            }
            System.out.println(totalNum);
        }
    }
}